package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    public ShoppingCartServiceImpl(DishMapper dishMapper, SetmealMapper setmealMapper) {
        this.dishMapper = dishMapper;
        this.setmealMapper = setmealMapper;
    }

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 设置userid，只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        // 判断当前商品是否存在购物车中
        if(shoppingCartList != null && shoppingCartList.size() > 0) {
            // 如果已经存在，就更新数量，数量加一
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else{
            // 如果不存在，直接插入数据
            // 判断添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null) {
                // 添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                // 添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                                                .userId(BaseContext.getCurrentId())
                                                .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        return shoppingCartList;
    }

    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 设置查询状态，查询当前登录用户下的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList != null && shoppingCartList.size() > 0) {
            shoppingCart = shoppingCartList.get(0);
            Integer number = shoppingCart.getNumber();
            // 如果商品在购物车中的数量为1，直接删除当前记录
            if(number == 1) shoppingCartMapper.deleteById(shoppingCart.getId());
            // 如果商品在购物车中的数量大于1，修改Number值

            else{
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
